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x in (-oo:+oo)
x/3-x-(3/3)+5 = 3*x-3 // - 3*x-3
x/3-x-(3*x)-(3/3)+3+5 = 0
x/3-x-3*x-1+3+5 = 0
7-11/3*x = 0 // - 7
-11/3*x = -7 // : -11/3
x = -7/(-11/3)
x = 21/11
x = 21/11
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